“一个半综合征”是脑干病变所致的一种特殊的眼球运动障碍,特征是病侧眼固定于中间位,对侧眼不能内收,外展时有单眼眼震。该眼征很少见,现将我们近3年收治的4例报告如下。临床资料 4例均为急性脑干血管病,均经临床、腰穿和CT检查确诊。“一个半综合征”均在起病1周内出现,同时伴有其它临床表现。分述如下: 例1,女,31岁。左侧桥脑出血,发病第2天出现“一个半综合征”。伴有左侧 “One and a half syndromes” is a special eye movement disorder caused by brainstem lesions, characterized by the sick side of the eye fixed in the medial position, the contralateral eye can not be adducted, monocular nystagmus when abducting. The eye sign is rare, now we nearly 3 years admitted 4 cases are as follows. 4 cases of clinical data were acute brain stem disease, were clinically, lumbar puncture and CT examination confirmed. “One and a half syndromes” are within 1 week of onset, accompanied by other clinical manifestations. As follows: Example 1, female, 31 years old. Left pontine hemorrhage, the onset of the first two days, “one and a half syndrome.” Accompanied by the left